condition mean min max ZT0-3 2169.7 2169.7 2169.7 ZT4-7 1578.9 1578.9 1578.9 ZT8-11 1919.8000000000002 1919.8000000000002 1919.8000000000002 ZT12-15 2324.8999999999996 2324.8999999999996 2324.8999999999996 ZT16-19 2849.95 2849.95 2849.95 ZT20-23 2815.45 2815.45 2815.45